IL-8 receptor antagonists

ABSTRACT

This invention relates to novel compounds of Formula (I) to (VII), and compositions thereof, useful in the treatment of disease states mediated by the chemokine, Interleukin-8 (IL-8).

This application is a continuation of U.S. Ser. No. 10/532,956 filed Apr. 27, 2005 now abandoned, which is the §371 National Stage entry of PCT/US2003/033964, filed Oct. 28, 2003, which claims the benefit of U.S. provisional application No. 60/421,956 filed Oct. 29, 2002.

FIELD OF THE INVENTION

This invention relates to novel sulfonamide substituted diphenyl urea compounds, pharmaceutical compositions, processes for their preparation, and use thereof in treating IL-8, GROα, GROβ, GROγ, NAP-2, and ENA-78 mediated diseases.

BACKGROUND OF THE INVENTION

Many different names have been applied to Interleukin-8 (IL-8), such as neutrophil attractant/activation protein-1 (NAP-1), monocyte derived neutrophil chemotactic factor (MDNCF), neutrophil activating factor (NAF), and T-cell lymphocyte chemotactic factor. Interleukin-8 is a chemoattractant for neutrophils, basophils, and a subset of T-cells. It is produced by a majority of nucleated cells including macrophages, fibroblasts, endothelial and epithelial cells exposed to TNF, IL-1α, IL-1β or LPS, and by neutrophils themselves when exposed to LPS or chemotactic factors such as FMLP. M. Baggiolini et al., J. Clin. Invest. 84, 1045 (1989); J. Schroder et al, J. Immunol. 139, 3474 (1987) and J. Immunol. 144, 2223 (1990); Strieter, et al., Science 243, 1467 (1989) and J. Biol. Chem. 264, 10621 (1989); Cassatella et al., J. Immunol. 148, 3216 (1992).

GROα, GROβ, GROγ and NAP-2 also belong to the chemokine family. Like IL-8 these chemokines have also been referred to by different names. For instance GROα, β, γ have been referred to as MGSAα, β, and γ respectively (Melanoma Growth Stimulating Activity), see Richmond et al., J. Cell Physiology 129, 375 (1986) and Chang et al., J. Immunol. 148, 451 (1992). All of the chemokines of the α-family which possess the ELR motif directly preceding the CXC motif bind to the IL-8 B receptor (CXCR2).

IL-8, GROα, GROβ, GROγ, NAP-2, and ENA-78 stimulate a number of functions in vitro. They have all been shown to have chemoattractant properties for neutrophils, while IL-8 and GROα have demonstrated T-lymphocytes, and basophilic chemotactic activity. In addition IL-8 can induce histamine release from basophils from both normal and atopic individuals. GRO-α and IL-8 can in addition, induce lysosomal enzyme release and respiratory burst from neutrophils. IL-8 has also been shown to increase the surface expression of Mac-1 (CD11b/CD18) on neutrophils without de novo protein synthesis. This may contribute to increased adhesion of the neutrophils to vascular endothelial cells. Many known diseases are characterized by massive neutrophil infiltration. As IL-8, GROα, GROβ, GROγ and NAP-2 promote the accumulation and activation of neutrophils, these chemokines have been implicated in a wide range of acute and chronic inflammatory disorders including psoriasis and rheumatoid arthritis, Baggiolini et al., FEBS Lett. 307, 97 (1992); Miller et al., Crit. Rev. Immunol. 12, 17 (1992); Oppenheim et al., Annu. Rev. Immunol. 9, 617 (1991); Seitz et al., J. Clin. Invest. 87, 463 (1991); Miller et al., Am. Rev. Respir. Dis. 146, 427 (1992); Donnely et al., Lancet 341, 643 (1993). In addition the ELR chemokines (those containing the amino acids ELR motif just prior to the CXC motif) have also been implicated in angiostasis, Strieter et al., Science 258, 1798 (1992).

In vitro, IL-8, GROα, GROβ, GROγ and NAP-2 induce neutrophil shape change, chemotaxis, granule release, and respiratory burst, by binding to and activating receptors of the seven-transmembrane, G-protein-linked family, in particular by binding to IL-8 receptors, most notably the IL-8β, receptor (CXCR2). Thomas et al., J. Biol. Chem. 266, 14839 (1991); and Holmes et al., Science 253, 1278 (1991). The development of non-peptide small molecule antagonists for members of this receptor family has precedent. For a review see R. Freidinger in: Progress in Drug Research, Vol. 40, pp. 33-98, Birkhauser Verlag, Basel 1993. Hence, the IL-8 receptor represents a promising target for the development of novel anti-inflammatory agents.

Two high affinity human IL-8 receptors (77% homology) have been characterized: IL-8Rα, which binds only IL-8 with high affinity, and IL-8Rβ, which has high affinity for IL-8 as well as for GROα, GROβ, GROγ and NAP-2. See Holmes et al., supra; Murphy et al., Science 253, 1280 (1991); Lee et al., J. Biol. Chem. 267, 16283 (1992); LaRosa et al., J. Biol. Chem. 267, 25402 (1992); and Gayle et al., J. Biol. Chem. 268, 7283 (1993).

There remains a need for treatment, in this field, for compounds, which are capable of binding to the IL-8 α or β receptor. Therefore, conditions associated with an increase in IL-8 production (which is responsible for chemotaxis of neutrophil and T-cells subsets into the inflammatory site) would benefit by compounds, which are inhibitors of IL-8 receptor binding.

SUMMARY OF THE INVENTION

This invention provides for a method of treating a chemokine mediated disease, wherein the chemokine is one which binds to an IL-8 a or b receptor and which method comprises administering an effective amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof. In particular the chemokine is IL-8.

This invention also relates to a method of inhibiting the binding of IL-8 to its receptors in a mammal in need thereof which comprises administering to said mammal an effective amount of a compound of Formula (I).

The present invention also provides for the novel compounds of Formula (I), and pharmaceutical compositions comprising a compound of Formula (I), and a pharmaceutical carrier or diluent.

Compounds of Formula (I) useful in the present invention are represented by the structure:

wherein

-   R_(b) is independently hydrogen, NR₆R₇, OH, OR_(a), C₁₋₅alkyl, aryl,     arylC₁₋₄alkyl, aryl C₂₋₄alkenyl; cycloalkyl, cycloalkyl C₁₋₅ alkyl,     heteroaryl, heteroarylC₁₋₄alkyl, heteroarylC₂₋₄ alkenyl,     heterocyclic, heterocyclic C₁₋₄alkyl, or a heterocyclic C₂₋₄alkenyl     moiety, all of which moieties may be optionally substituted one to     three times independently by halogen; nitro; halosubstituted C₁₋₄     alkyl; C₁₋₄ alkyl; amino, mono or di-C₁₋₄ alkyl substituted amine;     OR_(a); C(O)R_(a); NR_(a)C(O)OR_(a); OC(O)NR₆R₇; hydroxy;     NR₉C(O)R_(a); S(O)_(m′)R_(a); C(O)NR₆R₇; C(O)OH; C(O)OR_(a);     S(O)₂NR₆R₇; NHS(O)₂R_(a). Alternatively, the two R_(b) substituents     can join to form a 3-10 membered ring, optionally substituted and     containing, in addition to carbon, independently, 1 to 3 NR_(a), O,     S, SO, or SO₂ moities which can be optionally unsaturated. -   R_(a) is an alkyl, aryl, arylC₁₋₄alkyl, heteroaryl, heteroaryl     C₁₋₄alkyl, heterocyclic, COOR_(a), or a heterocyclic C₁₋₄alkyl     moiety, all of which moieties may be optionally substituted; -   m is an integer having a value of 1 to 3; -   m′ is 0, or an integer having a value of 1 or 2; -   n is an integer having a value of 1 to 3; -   q is 0, or an integer having a value of 1 to 10; -   t is 0, or an integer having a value of 1 or 2; -   s is an integer having a value of 1 to 3; -   R₁ is independently selected from hydrogen; halogen; nitro; cyano;     C₁₋₁₀ alkyl; halosubstituted C₁₋₁₀ alkyl; C₂₋₁₀ alkenyl; C₁₋₁₀     alkoxy; halosubstituted C₁₋₁₀alkoxy; azide; S(O)_(t)R₄; (CR₈R₈)_(q)     S(O)_(t)R₄; hydroxy; hydroxy substituted C₁₋₄alkyl; aryl; aryl C₁₋₄     alkyl; aryl C₂₋₁₀ alkenyl; aryloxy; aryl C₁₋₄ alkyloxy; heteroaryl;     heteroarylalkyl; heteroaryl C₂₋₁₀ alkenyl; heteroaryl C₁₋₄ alkyloxy;     heterocyclic, heterocyclic C₁₋₄alkyl; heterocyclicC₁₋₄alkyloxy;     heterocyclicC₂₋₁₀ alkenyl; (CR₈R₈)_(q) NR₄R₅; (CR₈R₈)_(q)C(O)NR₄R₅;     C₂₋₁₀ alkenyl C(O)NR₄R₅; (CR₈R₈)_(q) C(O)NR₄R₁₀; S(O)₃R₈;     (CR₈R₈)_(q) C(O)R₁₁; C₂₋₁₀ alkenyl C(O)R₁₁; C₂₋₁₀ alkenyl C(O)OR₁₁;     (CR₈R₈)_(q) C(O)OR₁₁; (CR₈R₈)_(q) OC(O)R₁₁; (CR₈R₈)_(q)NR₄C(O)R₁₁;     (CR₈R₈)_(q) C(NR₄)NR₄R₅; (CR₈R₈)_(q) NR₄C(NR₅)R₁₁; (CR₈R₈)_(q)     NHS(O)₂R₁₃; (CR₈R₈)_(q) S(O)₂NR₄R₅; or two R₁ moieties together may     form O—(CH₂)_(S)O or a 5 to 6 membered saturated or unsaturated     ring, and wherein the alkyl, aryl, arylalkyl, heteroaryl,     heterocyclic moieties may be optionally substituted; -   R₄ and R₅ are independently hydrogen, optionally substituted C₁₋₄     alkyl, optionally substituted aryl, optionally substituted aryl     C₁₋₄alkyl, optionally substituted heteroaryl, optionally substituted     heteroaryl C₁₋₄alkyl, heterocyclic, heterocyclicC₁₋₄ alkyl, or R₄     and R₅ together with the nitrogen to which they are attached form a     5 to 7 member ring which may optionally comprise an additional     heteroatom selected from 0/N/S; -   R₆ and R₇ are independently hydrogen, or a C₁₋₄ alkyl, heteroaryl,     aryl, alkyl aryl, alkyl C₁₋₄ heteroalkyl or R₆ and R₇ together with     the nitrogen to which they are attached form a 5 to 7 member ring     which ring may optionally contain an additional heteroatom is     selected from oxygen, nitrogen or sulfur, and which ring may be     optionally substituted; -   Y is hydrogen; halogen; nitro; cyano; halosubstituted C₁₋₁₀ alkyl;     C₁₋₁₀ alkyl; C₂₋₁₀ alkenyl; C₁₋₁₀ alkoxy; halosubstituted C₁₋₁₀     alkoxy; azide; (CR₈R₈)_(q)S(O)_(t)R_(a), (CR₈R₈)_(q)OR_(a); hydroxy;     hydroxy substituted C₁₋₄alkyl; aryl; aryl C₁₋₄ alkyl; aryloxy;     arylC₁₋₄ alkyloxy; aryl C₂₋₁₀ alkenyl; heteroaryl; heteroarylalkyl;     heteroaryl C₁₋₄ alkyloxy; heteroaryl C₂₋₁₀ alkenyl; heterocyclic;     heterocyclic C₁₋₄alkyl; heterocyclicC₂₋₁₀ alkenyl; (CR₈R₈)_(q)NR₄R₅;     C₂₋₁₀ alkenyl C(O)NR₄R₅; (CR₈R₈)_(q)C(O)NR₄R₅; (CR₈R₈)_(q)     C(O)NR₄R₁₀; S(O)₃R₈; (CR₈R₈)_(q)C(O)R₁₁; C₂₋₁₀ alkenylC(O)R₁₁;     (CR₈R₈)_(q)C(O)OR₁₁; C₂₋₁₀alkenylC(O)OR₁₁; (CR₈R₈)_(q)OC(O)R₁₁;     (CR₈R₈)_(q)NR₄C(O)R₁₁; (CR₈R₈)_(q) NHS(O)₂R₁₃; (CR₈R₈)_(q)     S(O)₂NR₄R₅; (CR₈R₈)_(q)C(NR₄)NR₄R₅; (CR₈R₈)_(q) NR₄C(NR₅)R₁₁; or two     Y moieties together may form O—(CH₂)_(S)—0 or a 5 to 6 membered     saturated or unsaturated ring; and wherein the alkyl, aryl,     arylalkyl, heteroaryl, heteroaryl alkyl, heterocyclic,     heterocyclicalkyl groups may be optionally substituted; -   R₈ is hydrogen or C₁₋₄ alkyl; -   R₉ is hydrogen or a C₁₋₄ alkyl; -   R₁₀ is C₁₋₁₀ alkyl C(O)₂R₈; -   R₁₁ is hydrogen, optionally substituted C₁₋₄ alkyl, optionally     substituted aryl, optionally substituted aryl C₁₋₄alkyl, optionally     substituted heteroaryl, optionally substituted heteroarylC₁₋₄alkyl,     optionally substituted heterocyclic, or optionally substituted     heterocyclicC₁₋₄alkyl; -   R₁₃ is suitably C₁₋₄ alkyl, aryl, aryl C₁₋₄alkyl, heteroaryl,     heteroarylC₁₋₄alkyl, heterocyclic, or heterocyclicC₁₋₄alkyl;     or a pharmaceutically acceptable salt thereof.

DETAILED DESCRIPTION OF THE INVENTION

The compounds of Formula (I), may also be used in association with the veterinary treatment of mammals, other than humans, in need of inhibition of IL-8 or other chemokines which bind to the IL-8 α and β receptors. Chemokine mediated diseases for treatment, therapeutically or prophylactically, in animals include disease states such as those noted herein in the Methods of Treatment section.

-   -   Suitably, R_(b) is independently hydrogen, NR₆R₇, OH, OR_(a),         C₁₋₄alkyl, aryl, arylC₁₋₄alkyl, aryl C₂₋₄alkenyl, heteroaryl,         heteroarylC₁₋₄alkyl, heteroarylC₂₋₄ alkenyl, heterocyclic,         heterocyclic C₁₋₄alkyl, or a heterocyclic C₂₋₄alkenyl moiety,         all of which moieties may be optionally substituted one to three         times independently by halogen; nitro; halosubstituted C₁₋₄         alkyl; C₁₋₄ alkyl; amino, mono or di-C₁₋₄ alkyl substituted         amine; cycloalkyl, cycloalkyl C₁₋₅ alkyl, OR_(a); C(O)R_(a);         NR_(a)C(O)OR_(a); OC(O)NR₆R₇; aryloxy; aryl C₁₋₄ oxy; hydroxy;         C₁₋₄ alkoxy; NR₉C(O)R_(a); S(O)_(m′)R_(a); C(O)NR₆R₇; C(O)OH;         C(O)OR_(a); S(O)₂NR₆R₇; NHS(O)₂R_(a); Alternatively, the two         R_(b) substituents can join to form a 3-10 membered ring,         optionally substituted and containing, in addition to carbon,         independently, 1 to 3 NR₉, O, S, SO, or SO₂ moities which can be         optionally substituted.

Suitably, R_(a) is an alkyl, aryl, arylC₁₋₄alkyl, heteroaryl, heteroaryl C₁₋₄alkyl, heterocyclic, or a heterocyclic C₁₋₄alkyl moiety, all of which moieties may be optionally substituted.

Suitably R₁ is independently selected from hydrogen; halogen; nitro; cyano; halosubstituted C₁₋₁₀ alkyl, such as CF₃; C₁₋₁₀ alkyl, such as methyl, ethyl, isopropyl, or n-propyl; C₂₋₁₀ alkenyl; C₁₋₁₀ alkoxy, such as methoxy, or ethoxy; halosubstituted C₁₋₁₀ alkoxy, such as trifluoromethoxy; azide; (CR₈R₈)_(q) S(O)_(t)R₄, wherein t is 0, 1 or 2; hydroxy; hydroxy C₁₋₄ alkyl, such as methanol or ethanol; aryl, such as phenyl or naphthyl; aryl C₁₋₄ alkyl, such as benzyl; aryloxy, such as phenoxy; aryl C₁₋₄ alkyloxy, such as benzyloxy; heteroaryl; heteroarylalkyl; heteroaryl C₁₋₄ alkyloxy; aryl C₂₋₁₀ alkenyl; heteroaryl C₂₋₁₀ alkenyl; heterocyclic C₂₋₁₀ alkenyl; (CR₈R₈)_(q)NR₄R₅; C₂₋₁₀ alkenyl C(O)NR₄R₅; (CR₈R₈)_(q)C(O)NR₄R₅; (CR₈R₈)_(q)C(O)NR₄R₁₀; S(O)₃H; S(O)₃R₈; (CR₈R₈)_(q)C(O)R₁₁; C₂₋₁₀ alkenyl C(O)R₁₁; C₂₋₁₀ alkenyl C(O)OR₁₁; (CR₈R₈)_(q) C(O)R₁₁; (CR₈R₈)_(q)C(O)OR₁₁; (CR₈R₈)_(q) OC(O)R₁₁; (CR₈R₈)_(q)NR₄C(O)R₁₁; (CR₈R₈)_(q)C(NR₄)NR₄R₅; (CR₈R₈)_(q) NR₄C(NR₅)R₁₁; (CR₈R₈)_(q)NHS(O)₂R₁₃; (CR₈R₈)_(q)S(O)₂NR₄R₅. All of the aryl, heteroaryl, and heterocyclic containing moieties may be optionally substituted as defined herein below.

For use herein the term “the aryl, heteroaryl, and heterocyclic containing moieties” refers to both the ring and the alkyl, or if included, the alkenyl rings, such as aryl, arylalkyl, and aryl alkenyl rings. The term “moieties” and “rings” may be interchangeably used throughout.

Suitably, R₄ and R₅ are independently hydrogen, optionally substituted C₁₋₄ alkyl, optionally substituted aryl, optionally substituted aryl C₁₋₄alkyl, optionally substituted heteroaryl, optionally substituted heteroaryl C₁₋₄alkyl, heterocyclic, heterocyclicC₁₋₄ alkyl, or R₄ and R₅ together with the nitrogen to which they are attached form a 5 to 7 member ring which may optionally comprise an additional heteroatom selected from O/N/S.

Suitably, R₈ is independently hydrogen or C₁₋₄ alkyl.

Suitably, R₉ is hydrogen or a C₁₋₄ alkyl;

Suitably, q is 0 or an integer having a value of 1 to 10.

Suitably, R₁₀ is C₁₋₁₀ alkyl C(O)₂R₈, such as CH₂C(O)₂H or CH₂C(O)₂CH₃.

Suitably, R₁₁ is hydrogen, C₁₋₄ alkyl, aryl, aryl C₁₋₄ alkyl, heteroaryl, heteroaryl C₁₋₄alkyl, heterocyclic, or heterocyclic C₁₋₄alkyl.

Suitably, R₁₂ is hydrogen, C₁₋₁₀ alkyl, optionally substituted aryl or optionally substituted arylalkyl.

Suitably, R₁₃ is C₁₋₄alkyl, aryl, arylalkyl, heteroaryl, heteroarylC₁₋₄alkyl, heterocyclic, or heterocyclicC₁₋₄alkyl, wherein all of the aryl, heteroaryl and heterocyclic containing moieties may all be optionally substituted.

Suitably, Y is independently selected from hydrogen; halogen; nitro; cyano; halosubstituted C₁₋₁₀ alkyl; C₁₋₁₀ alkyl; C₂₋₁₀ alkenyl; C₁₋₁₀ alkoxy; halosubstituted C₁₋₁₀ alkoxy; azide; (CR₈R₈)_(q) S(O)_(t)R_(a); hydroxy; hydroxyC₁₋₄alkyl; aryl; aryl C₁₋₄ alkyl; aryloxy; arylC₁₋₄ alkyloxy; heteroaryl; heteroarylalkyl; heteroaryl C₁₋₄ alkyloxy; heterocyclic, heterocyclic C₁₋₄alkyl; aryl C₂₋₁₀ alkenyl; heteroaryl C₂₋₁₀ alkenyl; heterocyclic C₂₋₁₀ alkenyl; (CR₈R₈)_(q) NR₄R₅; C₂₋₁₀ alkenyl C(O)NR₄R₅; (CR₈R₈)_(q) C(O)NR₄R₅; (CR₈R₈)_(q) C(O)NR₄R₁₀; S(O)₃H; S(O)₃R₈; (CR₈R₈)_(q) C(O)R₁₁; C₂₋₁₀ alkenyl C(O)R₁₁; C₂₋₁₀ alkenyl C(O)OR₁₁; (CR₈R₈)_(q) C(O)OR₁₂; (CR₈R₈)_(q) OC(O)R₁₁; (CR₈R₈)_(q)C(NR₄)NR₄R₅; (CR₈R₈)_(q) NR₄C(NR₅)R₁₁; (CR₈R₈)_(q) NR₄C(O)R₁₁; (CR₈R₈)_(q) NHS(O)₂R₁₃; or (CR₈R₈)_(q) S(O)₂NR₄R₅; or two Y moieties together may form O—(CH₂)_(S)—O or a 5 to 6 membered saturated or unsaturated ring. The aryl, heteroaryl and heterocyclic containing moieties noted above may all be optionally substituted as defined herein.

Suitably s is an integer having a value of 1 to 3.

When Y forms a dioxybridge, s is preferably 1. When Y forms an additional unsaturated ring, it is preferably 6 membered resulting in a naphthylene ring system. These ring systems may be substituted 1 to 3 times by other Y moieties as defined above.

Suitably, R_(a) is an alkyl, aryl C₁₋₄ alkyl, heteroaryl, heteroaryl-C₁₋₄alkyl, heterocyclic, or a heterocyclicC₁₋₄ alkyl, wherein all of these moieties may all be optionally substituted.

Y is preferably a halogen, C₁₋₄ alkoxy, optionally substituted aryl, optionally substituted aryloxy or arylalkoxy, methylene dioxy, NR₄R₅, thio C₁₋₄alkyl, thioaryl, halosubstituted alkoxy, optionally substituted C₁₋₄ alkyl, or hydroxy alkyl. Y is more preferably mono-substituted halogen, disubstituted halogen, mono-substituted alkoxy, disubstituted alkoxy, methylenedioxy, aryl, or alkyl, more preferably these groups are mono or di-substituted in the 2′-position or 2′-, 3′-position.

While Y may be substituted in any of the ring positions, n is preferably one. While both R₁ and Y can both be hydrogen, it is preferred that at least one of the rings is substituted, preferably both rings are substituted.

As used herein, “optionally substituted” unless specifically defined shall mean such groups as halogen, such as fluorine, chlorine, bromine or iodine; hydroxy; hydroxy substituted C₁₋₁₀ alkyl; C₁₋₁₀ alkoxy, such as methoxy or ethoxy; S(O)_(m′)C₁₋₁₀ alkyl, wherein m′ is 0, 1 or 2, such as methyl thio, methyl sulfinyl or methyl sulfonyl; amino, mono & di-substituted amino, such as in the NR₄R₅ group; NHC(O)R₄; C(O)NR₄R₅; C(O)OH; S(O)₂NR₄R₅; NHS(O)₂R₂₀, C₁₋₁₀ alkyl, such as methyl, ethyl, propyl, isopropyl, or t-butyl; halosubstituted C₁₋₁₀ alkyl, such CF₃; an optionally substituted aryl, such as phenyl, or an optionally substituted arylalkyl, such as benzyl or phenethyl, optionally substituted heterocylic, optionally substituted heterocyclicalkyl, optionally substituted heteroaryl, optionally substituted heteroaryl alkyl, wherein these aryl, heteroaryl, or heterocyclic moieties may be substituted one to two times by halogen; hydroxy; hydroxy substituted alkyl; C₁₋₁₀ alkoxy; S(O)_(m′)C₁₋₁₀ alkyl; amino, mono & di-substituted alkyl amino, such as in the NR₄R₅ group; C₁₋₁₀ alkyl, or halosubstituted C₁₋₁₀ alkyl, such as CF₃.

R₂₀ is suitably C₁₋₄ alkyl, aryl, aryl C₁₋₄alkyl, heteroaryl, heteroarylC₁₋₄alkyl, heterocyclic, or heterocyclicC₁₋₄alkyl.

Suitable pharmaceutically acceptable salts are well known to those skilled in the art and include basic salts of inorganic and organic acids, such as hydrochloric acid, hydrobromic acid, sulphuric acid, phosphoric acid, methane sulphonic acid, ethane sulphonic acid, acetic acid, malic acid, tartaric acid, citric acid, lactic acid, oxalic acid, succinic acid, fumaric acid, maleic acid, benzoic acid, salicylic acid, phenylacetic acid and mandelic acid. In addition, pharmaceutically acceptable salts of compounds of Formula (I) may also be formed with a pharmaceutically acceptable cation. Suitable pharmaceutically acceptable cations are well known to those skilled in the art and include alkaline, alkaline earth, ammonium and quaternary ammonium cations.

The following terms, as used herein, refer to:

-   -   “halo”—all halogens, that is chloro, fluoro, bromo and iodo.     -   “C₁₋₁₀alkyl” or “alkyl”—both straight and branched chain         moieties of 1 to 10 carbon atoms, unless the chain length is         otherwise limited, including, but not limited to, methyl, ethyl,         n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl,         n-pentyl and the like.     -   “cycloalkyl” is used herein to mean cyclic moiety, preferably of         3 to 8 carbons, including but not limited to cyclopropyl,         cyclopentyl, cyclohexyl, and the like.     -   “alkenyl” is used herein at all occurrences to mean straight or         branched chain moiety of 2-10 carbon atoms, unless the chain         length is limited thereto, including, but not limited to         ethenyl, 1-propenyl, 2-propenyl, 2-methyl-1-propenyl, 1-butenyl,         2-butenyl and the like.     -   “aryl”—phenyl and naphthyl;     -   “heteroaryl” (on its own or in any combination, such as         “heteroaryloxy”, or “heteroaryl alkyl”)—a 5-10 membered aromatic         ring system in which one or more rings contain one or more         heteroatoms selected from the group consisting of N, O or S,         such as, but not limited, to pyrrole, pyrazole, furan,         thiophene, quinoline, isoquinoline, quinazolinyl, pyridine,         pyrimidine, oxazole, tetrazole, thiazole, thiadiazole, triazole,         imidazole, or benzimidazole.     -   “heterocyclic” (on its own or in any combination, such as         “heterocyclicalkyl”)—a saturated or partially unsaturated 4-10         membered ring system in which one or more rings contain one or         more heteroatoms selected from the group consisting of N, O, or         S; such as, but not limited to, pyrrolidine, piperidine,         piperazine, morpholine, tetrahydropyran, thiomorpholine, or         imidazolidine. Furthermore, sulfur may be optionally oxidized to         the sulfone or the sulfoxide.     -   “arylalkyl” or “heteroarylalkyl” or “heterocyclicalkyl” is used         herein to mean C₁₋₁₀ alkyl, as defined above, attached to an         aryl, heteroaryl or heterocyclic moiety, as also defined herein,         unless otherwise indicated.     -   “sulfinyl”—the oxide S(O) of the corresponding sulfide, the term         “thio” refers to the sulfide, and the term “sulfonyl” refers to         the fully oxidized S(O)₂ moiety.     -   “wherein two R₁ moieties (or two Y moieties) may together form a         5 or 6 membered saturated or unsaturated ring” is used herein to         mean the formation of an aromatic ring system, such as         naphthalene, or is a phenyl moiety having attached a 6 membered         partially saturated or unsaturated ring such as a C₆         cycloalkenyl, i.e. hexene, or a C₅ cycloalkenyl moiety, such as         cyclopentene.

Illustrative compounds of Formula (J) include:

-   N-[4-chloro-2-hydroxy-3-(4-methyl-piperazine-1-sulfonyl)-phenyl]-N′-(2-chloro-3-fluorophenyl)     urea; -   N-[4-chloro-2-hydroxy-3-(4-(2-hydroxyethyl)-piperazine-1-sulfonyl)phenyl]-N′-(2-chloro-3-fluorophenyl)     urea; -   N-[4-chloro-2-hydroxy-3-(1-piperazinylsulfonyl)phenyl]-N′-(2-chloro-3-fluorophenyl)     urea or a pharmaceutically acceptable salt thereof.     The above mentioned compounds have improved developability     characteristics relative to their most closely related counterparts     which have been claimed previously. In addition, the potency towards     the therapeutic target has been maintained or improved.

Methods of Preparation

The compounds of Formulas (I) may be obtained by applying synthetic procedures, some of which are illustrated in the Scheme 1 below. The synthesis provided for in these Schemes is applicable for the producing compounds of Formulas (I) having a variety of different R, R′ and Aryl (optionally substituted) groups which are reacted, employing optional substituents which are suitably protected, to achieve compatibility with the reactions outlined herein. Subsequent deprotection, in those cases, then affords compounds of the nature generally disclosed. Once the urea nucleus has been established, further compounds of these formulas may be prepared by applying standard techniques for functional group interconversion, well known in the art.

EXAMPLE 1 1a) 2-chloro-3-fluorobenzoic acid

A solution of 3-fluorobenzoic acid (4.02 g, 28.71 mmol) in 20 mL of THF was added dropwise to a suspension of TMEDA (10.00 mL, 66.3 mmol) and 1.3M sec-BuLi (48 mL, 62.4 mmol) in 50 mL of THF at −90° C. The mixture was stirred at −90° C. for 35 min. The mixture was warmed to −78° C. when a solution of hexachloroethane (27.0 g, 113.9 mmol) in 50 mL of THF was added. After 20 h, the reaction was quenched with water and diluted with diethyl ether. The bilayer was adjusted to pH ˜1-2 with conc. HCl. The organic layer was washed with water, brine, dried and concentrated to give 30.4 g crude as a tan solid, which was washed with hexane to give 3.728 g (74%) of the desired product 1a (light tan solid). MS (m/z) 175.2 (M+H).

1b) 3-chloro-2-fluoro-benzoyl azide

A suspension of 2-chloro-3-fluorobenzoic acid (example 1a) (2.704 g, 15.54 mmol) in 25 mL of oxalyl chloride was heated to reflux for 2 h. The solution was cooled and concentrated to give the crude acid chloride 3.13 g as a brown liquid which was directly used in the next step.

A solution of NaN₃ (2.79 g, 43 mmol) in 10 mL of water was added dropwise to a solution of the crude acid chloride (3.13 g) in 20 mL acetone at 0° C. After 15 min, the solution was diluted with CH₂Cl₂ and washed with water and brine. The organic layer was dried and concentrated to give a brown liquid which was filtered through silica gel using ethyl acetate/hexane (5/95, v/v) to yield 2.97 g (96%) of 1b (colorless liquid). The compound was used without further purification.

1c) 2-(2-tert-Butyl-6-chloro-benzooxazole-7-sulfonyl)-piperazine-1-carboxylic acid tert-butyl ester

The solution of 2-tert-butyl-6-chloro-benzooxazole-7-sulfonyl chloride (10.75 g, 34.9 mmol) in 100 mL of THF was cooled to 0° C., Et₃N (3.47 mL, 24.9 mmol) and then Boc-piperazine (5.0 g, 26.8 mmol) were added. The resulting mixture was stirred for 20 h, warming to room temperature. The mixture was poured into water, extracted with EtOAc and washed with another portion of water; organic layers were dried and concentrated. Purification by column chromatography on silica gel, eluting with ethyl acetate/hexane (30/70, v/v), yielded 11.12 g (91%) desired product 1c. LC-MS (m/z) 458.2 (M+H).

1d) 4-(3-Amino-6-chloro-2-hydroxy-benzenesulfonyl)-piperazine-1-carboxylic acid tert-butyl ester

The solution of starting material 1c (11.12 g) in dioxane (20 mL) was treated with water (11 mL) and conc. H₂SO₄ (11 mL). The mixture was heated to reflux for 12 h. The reaction mixture was concentrated and then basified the residue to pH˜14 with 50% aq NaOH. (Boc)₂O (5.6 g, 1.05 eq) and 100 mL of AcOEt were added, the resulting mixture was stirred at room temperature for 16 h. The mixture was separated, the water layer was extracted with EtOAc, organic layers were combined, dried and concentrated. Purification by column chromatography on silica gel, eluting with ethyl acetate/hexane (30/70, v/v), yielded 8.18 g (85%) desired product 1d. ¹H NMR (CDCl₃): δ 6.85 (m, 2H), 3.48 (t, 4H), 3.25 (t, 4H), 1.47 (s, 9H).

1e) 4-(6-chloro-3-[3-(2-chloro-3-fluorophenyl)-ureido]-2-hydroxy-benzenesulfonyl)-piperazine-1-carboxylic acid tert-butyl ester

A solution of 1d (3.8 g, 9.7 mmol) and 3-chloro-2-fluorobenzoyl azide (1b) (2.9 g, 14.5 mmol) in 5 mL of N,N-dimethylformamide was stirred at room temperature for 18 h. The mixture was diluted with ethyl acetate and washed with water to give the crude material. Purification by column chromatography on silica gel, eluting with ethyl acetate/hexane (20/80, v/v), gave 3.6 g (66%) of 1e. LC-MS (m/z) 562.8 (M+H).

1f) 1-(2-Chloro-3-fluorophenyl)-3-[4-chloro-2-hydroxy-3-(piperazine-1-sulfonyl)-phenyl]-urea hydrochloride

A solution of 3.6 g Boc-product in 20 mL of 4N HCl in dioxane was stirred at room temperature for 2 h and the solvent was evaporated. The residue was recrystallized from methanol and ethyl acetate to give the title product 2.9 g, (60%). LC-MS (m/z) 463.0 (M+H).

EXAMPLE 2 2a) tert-Butyl-6-chloro-7-(4-(2-methoxyethyl)-piperazine-1-sulfonyl]-benzooxazole

Followed the general procedure described in Example 1c, 2-tert-butyl-6-chloro-benzooxazole-7-sulfonyl chloride coupled with 2-methoxy-ethyl-piperazine to give the desired product 2a, 1.11 g (82%). LC-MS (m/z) 416.2 (M+H).

2b) 6-Amino-3-chloro-2-[4-(2-methoxyethyl)-piperazine-1-sulfonyl]-phenol

Followed the general procedure described in Example 1d, tert-butyl-6-chloro-7-(4-(2-methoxy-ethyl)-piperazine-1-sulfonyl]-benzooxazole was hydrolyzed to give crude 2b which was used in the next step without further purification.

2c) 1-(2-Chloro-3-fluoro-phenyl)-3-{4-chloro-2-hydroxy-3-[4-(2-methoxyethyl)-piperazine-1-sulfonyl]-phenyl}-urea

Followed the general procedure described in Example 1e, 6-amino-3-chloro-2-[4-(2-methoxyl-ethyl)-piperazine-1-sulfonyl]-phenol and 3-chloro-2-fluorobenzoyl azide were coupled to give 168 mg (20% from 2a) of the product 2c (isolated as the trifluoroacetic acid salt following RP-HPLC purification). LC-MS (m/z) 521.2 (M+H).

2d) 1-(2-Chloro-3-fluorophenyl)-3-[4-chloro-2-hydroxy-3-[4-(2-hydroxyethyl)-piperazine-1-sulfonyl]-phenyl}-urea

Under Ar, to the suspension of 2c trifluoroacetic acid salt (100 mg, 0.16 mmol) in 3 mL of dichloromethane was added boron tribromide (0.63 mL, 0.63 mmol). The mixture was stirred at room temperature overnight. After quenching with methanol, solid produced. The mixture was filtered, solid was collected. Purification upon Gilson HPLC, eluting with acetonitrile/water/0.1% TFA (10/90, v/v to 90/10, v/v, over 10 min) yielding 66 mg (76%) of the title compound 2d. LC-MS (m/z) 507.2 (M+H).

3a) 2-tert-Butyl-6-chloro-7-(4-methylpiperazine-1-sulfonyl)-benzooxazole

Followed the general procedure described in Example 1c, 2-tert-butyl-6-chloro-benzooxazole-7-sulfonyl chloride coupled with methyl-piperazine to give the desired product 3a, 600 mg (53%). LC-MS (m/z) 372.0 (M+H).

3b) 6-Amino-3-chloro-2-(4-methylpiperazine-1-sulfonyl)-phenol

Followed the general procedure described in Example 1d, 2-tert-Butyl-6-chloro-7-(4-methyl-piperazine-1-sulfonyl)-benzooxazole was hydrolyzed to give 3b, 441 mg (89%). LC-MS (m/z) 306.2 (M+H).

3c) 1-(2-Chloro-3-fluorophenyl)-3-[4-chloro-2-hydroxy-3-(4-methylpiperazine-1-sulfonyl)-phenyl]-urea

Followed the general procedure described in Example 1e, 6-amino-3-chloro-2-(4-methyl-piperazine-1-sulfonyl)-phenol and 3-chloro-2-fluoro-benzoyl azide (1b) were coupled to give 203 mg (30%) of the title product 3c. LC-MS (m/z) 477.0 (M+H).

Method of Treatment

The compounds of Formula (I), or a pharmaceutically acceptable salt thereof can be used in the manufacture of a medicine for the prophylactic or therapeutic treatment of any disease state in a human, or other mammal, which is exacerbated or caused by excessive or unregulated IL-8 cytokine production by such mammal's cell, such as but not limited to monocytes and/or macrophages, or other chemokines which bind to the IL-8 α or β receptor, also referred to as the type I or type II receptor.

Accordingly, the present invention provides a method of treating a chemokine mediated disease, wherein the chemokine is one which binds to an IL-8 α or β receptor and which method comprises administering an effective amount of a compound of Formula (I) or a pharmaceutically acceptable salt thereof. In particular, the chemokines are IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78.

The compounds of Formula (I) are administered in an amount sufficient to inhibit cytokine function, in particular IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78, such that they are biologically regulated down to normal levels of physiological function, or in some case to subnormal levels, so as to ameliorate the disease state. Abnormal levels of IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 for instance in the context of the present invention, constitute: (i) levels of free IL-8 greater than or equal to 1 picogram per mL; (ii) any cell associated IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 above normal physiological levels; or (iii) the presence of IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 above basal levels in cells or tissues in which IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 respectively, is produced.

The compounds of Formula (I), in generally have been shown to have a longer t_(1/2) and improved oral bioavailability over the compounds disclosed in WO 96/25157 and WO 97/29743 whose disclosures are incorporated herein by reference.

There are many disease states in which excessive or unregulated IL-8 production is implicated in exacerbating and/or causing the disease. Chemokine mediated diseases include psoriasis, atopic dermatitis, arthritis (either osteo- or rheumatoid), asthma, chronic obstructive pulmonary disease, adult respiratory distress syndrome, inflammatory bowel disease, Crohn's disease, ulcerative colitis, stroke, septic shock, endotoxic shock, gram negative sepsis, toxic shock syndrome, cardiac and renal reperfusion injury, glomerulonephritis, thrombosis, graft vs. host reaction, alzheimers disease, allograft rejections, malaria, restinosis, angiogenesis, atherosclerosis, osteoporosis, gingivitis, viral diseases such as rhinovirus or undesired hematopoietic stem cell release.

These diseases are primarily characterized by massive neutrophil infiltration, T-cell infiltration, or neovascular growth, and are associated with increased IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 production which is responsible for the chemotaxis of neutrophils into the inflammatory site or the directional growth of endothelial cells. In contrast to other inflammatory cytokines (IL-1, TNF, and IL-6), IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 have the unique property of promoting neutrophil chemotaxis, enzyme release including but not limited to elastase release as well as superoxide production and activation. The α-chemokines but particularly, GROα, GROβ, GROγ, NAP-2 or ENA-78, working through the IL-8 type I or II receptor can promote the neovascularization of tumors by promoting the directional growth of endothelial cells. Therefore, the inhibition of IL-8 induced chemotaxis or activation would lead to a direct reduction in the neutrophil infiltration.

Recent evidence also implicates the role of chemokines in the treatment of HIV infections, Littleman et al., Nature 381, pp. 661 (1996) and Koup et al., Nature 381, pp. 667 (1996).

Present evidence also indicates the use of IL-8 inhibitors in the treatment of atherosclerosis. The first reference, Boisvert et al., J. Clin. Invest, 1998, 101:353-363 shows, through bone marrow transplantation, that the absence of IL-8 receptors on stem cells (and, therefore, on monocytes/macrophages) leads to a reduction in the development of atherosclerotic plaques in LDL receptor deficient mice. Additional supporting references are: Apostolopoulos, et al., Arterioscler. Thromb. Vasc. Biol. 1996, 16:1007-1012; Liu, et al., Arterioscler. Thromb. Vasc. Biol, 1997, 17:317-323; Rus, et al., Atherosclerosis. 1996, 127:263-271; Wang et al., J. Biol. Chem. 1996, 271:8837-8842; Yue, et al., Eur. J. Pharmacol. 1993, 240:81-84; Koch, et al., Am. J. Pathol., 1993, 142:1423-1431; Lee, et al., Immunol. Lett., 1996, 53, 109-113; and Terkeltaub et al., Arterioscler. Thromb., 1994, 14:47-53.

The present invention also provides for a means of treating, in an acute setting, as well as preventing, in those individuals deemed susceptible to, CNS injuries by the chemokine receptor antagonist compounds of Formula (I).

CNS injuries as defined herein include both open or penetrating head trauma, such as by surgery, or a closed head trauma injury, such as by an injury to the head region. Also included within this definition is ischemic stroke, particularly to the brain area.

Ischemic stroke may be defined as a focal neurologic disorder that results from insufficient blood supply to a particular brain area, usually as a consequence of an embolus, thrombi, or local atheromatous closure of the blood vessel. The role of inflammatory cytokines in this area has been emerging and the present invention provides a mean for the potential treatment of these injuries. Relatively little treatment, for an acute injury such as these has been available.

TNF-α is a cytokine with proinflammatory actions, including endothelial leukocyte adhesion molecule expression. Leukocytes infiltrate into ischemic brain lesions and hence compounds which inhibit or decrease levels of TNF would be useful for treatment of ischemic brain injury. See Liu et al., Stroke, Vol. 25, No. 7, pp. 1481-88 (1994) whose disclosure is incorporated herein by reference.

Models of closed head injuries and treatment with mixed 5-LO/CO agents is discussed in Shohami et al., J. of Vaisc & Clinical Physiology and Pharmacology, Vol. 3, No. 2, pp. 99-107 (1992) whose disclosure is incorporated herein by reference. Treatment which reduced edema formation was found to improve functional outcome in those animals treated.

The compounds of Formula (I) are administered in an amount sufficient to inhibit IL-8, binding to the IL-8 alpha or beta receptors, from binding to these receptors, such as evidenced by a reduction in neutrophil chemotaxis and activation. The discovery that the compounds of Formula (I) are inhibitors of IL-8 binding is based upon the effects of the compounds of Formulas (I) in the in vitro receptor binding assays which are described herein. The compounds of Formula (I) have been shown to be inhibitors of type II IL-8 receptors.

As used herein, the term “IL-8 mediated disease or disease state” refers to any and all disease states in which IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 plays a role, either by production of IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 themselves, or by IL-8, GROα, GROβ, GROγ, NAP-2 or ENA-78 causing another monokine to be released, such as but not limited to IL-1, IL-6 or TNF. A disease state in which, for instance, IL-1 is a major component, and whose production or action, is exacerbated or secreted in response to IL-8, would therefore be considered a disease state mediated by IL-8.

As used herein, the term “chemokine mediated disease or disease state” refers to any and all disease states in which a chemokine which binds to an IL-8 α or β receptor plays a role, such as but not limited to IL-8, GRO-α, GRO-0, GROγ, NAP-2 or ENA-78. This would include a disease state in which, IL-8 plays a role, either by production of IL-8 itself, or by IL-8 causing another monokine to be released, such as but not limited to IL-1, IL-6 or TNF. A disease state in which, for instance, IL-1 is a major component, and whose production or action, is exacerbated or secreted in response to IL-8, would therefore be considered a disease stated mediated by IL-8.

As used herein, the term “cytokine” refers to any secreted polypeptide that affects the functions of cells and is a molecule which modulates interactions between cells in the immune, inflammatory or hematopoietic response. A cytokine includes, but is not limited to, monokines and lymphokines, regardless of which cells produce them. For instance, a monokine is generally referred to as being produced and secreted by a mononuclear cell, such as a macrophage and/or monocyte. Many other cells however also produce monokines, such as natural killer cells, fibroblasts, basophils, neutrophils, endothelial cells, brain astrocytes, bone marrow stromal cells, epidermal keratinocytes and B-lymphocytes. Lymphokines are generally referred to as being produced by lymphocyte cells. Examples of cytokines include, but are not limited to, Interleukin-1 (IL-1), Interleukin-6 (IL-6), Interleukin-8 (IL-8), Tumor Necrosis Factor-alpha (TNF-α) and Tumor Necrosis Factor beta (TNF-β).

As used herein, the term “chemokine” refers to any secreted polypeptide that affects the functions of cells and is a molecule which modulates interactions between cells in the immune, inflammatory or hematopoietic response, similar to the term “cytokine” above. A chemokine is primarily secreted through cell transmembranes and causes chemotaxis and activation of specific white blood cells and leukocytes, neutrophils, monocytes, macrophages, T-cells, B-cells, endothelial cells and smooth muscle cells. Examples of chemokines include, but are not limited to IL-8, GRO-α, GROβ, GROγ, NAP-2, ENA-78, IP-10, MIP-1α, MIP-β, PF4, and MCP 1, 2, and 3.

In order to use a compound of Formula (I) or a pharmaceutically acceptable salt thereof in therapy, it will normally be formulated into a pharmaceutical composition in accordance with standard pharmaceutical practice. This invention, therefore, also relates to a pharmaceutical composition comprising an effective, non-toxic amount of a compound of Formula (I) and a pharmaceutically acceptable carrier or diluent.

Compounds of Formula (I), pharmaceutically acceptable salts thereof and pharmaceutical compositions incorporating such may conveniently be administered by any of the routes conventionally used for drug administration, for instance, orally, topically, parenterally or by inhalation. The compounds of Formula (I) may be administered in conventional dosage forms prepared by combining a compound of Formula (I) with standard pharmaceutical carriers according to conventional procedures. The compounds of Formula (I) may also be administered in conventional dosages in combination with a known, second therapeutically active compound. These procedures may involve mixing, granulating and compressing or dissolving the ingredients as appropriate to the desired preparation. It will be appreciated that the form and character of the pharmaceutically acceptable character or diluent is dictated by the amount of active ingredient with which it is to be combined, the route of administration and other well-known variables. The carrier(s) must be “acceptable” in the sense of being compatible with the other ingredients of the formulation and not deleterious to the recipient thereof.

The pharmaceutical carrier employed may be, for example, either a solid or liquid. Exemplary of solid carriers are lactose, terra alba, sucrose, talc, gelatin, agar, pectin, acacia, magnesium stearate, stearic acid and the like. Exemplary of liquid carriers are syrup, peanut oil, olive oil, water and the like. Similarly, the carrier or diluent may include time delay material well known to the art, such as glyceryl mono-stearate or glyceryl distearate alone or with a wax.

A wide variety of pharmaceutical forms can be employed. Thus, if a solid carrier is used, the preparation can be tableted, placed in a hard gelatin capsule in powder or pellet form or in the form of a troche or lozenge. The amount of solid carrier will vary widely but preferably will be from about 25 mg to about 1 g. When a liquid carrier is used, the preparation will be in the form of a syrup, emulsion, soft gelatin capsule, sterile injectable liquid such as an ampule or nonaqueous liquid suspension.

Compounds of Formula (I) may be administered topically, that is by non-systemic administration. This includes the application of a compound of Formula (I) externally to the epidermis or the buccal cavity and the instillation of such a compound into the ear, eye and nose, such that the compound does not significantly enter the blood stream. In contrast, systemic administration refers to oral, intravenous, intraperitoneal and intramuscular administration.

Formulations suitable for topical administration include liquid or semi-liquid preparations suitable for penetration through the skin to the site of inflammation such as liniments, lotions, creams, ointments or pastes, and drops suitable for administration to the eye, ear or nose. The active ingredient may comprise, for topical administration, from 0.001% to 10% w/w, for instance from 1% to 2% by weight of the Formulation. It may however comprise as much as 10% w/w but preferably will comprise less than 5% w/w, more preferably from 0.1% to 1% w/w of the Formulation.

Lotions according to the present invention include those suitable for application to the skin or eye. An eye lotion may comprise a sterile aqueous solution optionally containing a bactericide and may be prepared by methods similar to those for the preparation of drops. Lotions or liniments for application to the skin may also include an agent to hasten drying and to cool the skin, such as an alcohol or acetone, and/or a moisturizer such as glycerol or an oil such as castor oil or arachis oil.

Creams, ointments or pastes according to the present invention are semi-solid formulations of the active ingredient for external application. They may be made by mixing the active ingredient in finely-divided or powdered form, alone or in solution or suspension in an aqueous or non-aqueous fluid, with the aid of suitable machinery, with a greasy or non-greasy base. The base may comprise hydrocarbons such as hard, soft or liquid paraffin, glycerol, beeswax, a metallic soap; a mucilage; an oil of natural origin such as almond, corn, arachis, castor or olive oil; wool fat or its derivatives or a fatty acid such as steric or oleic acid together with an alcohol such as propylene glycol or a macrogel. The formulation may incorporate any suitable surface active agent such as an anionic, cationic or non-ionic surfactant such as a sorbitan ester or a polyoxyethylene derivative thereof. Suspending agents such as natural gums, cellulose derivatives or inorganic materials such as silicaceous silicas, and other ingredients such as lanolin, may also be included.

Drops according to the present invention may comprise sterile aqueous or oily solutions or suspensions and may be prepared by dissolving the active ingredient in a suitable aqueous solution of a bactericidal and/or fungicidal agent and/or any other suitable preservative, and preferably including a surface active agent. The resulting solution may then be clarified by filtration, transferred to a suitable container which is then sealed and sterilized by autoclaving or maintaining at 98-100° C. for half an hour. Alternatively, the solution may be sterilized by filtration and transferred to the container by an aseptic technique. Examples of bactericidal and fungicidal agents suitable for inclusion in the drops are phenylmercuric nitrate or acetate (0.002%), benzalkonium chloride (0.01%) and chlorhexidine acetate (0.01%). Suitable solvents for the preparation of an oily solution include glycerol, diluted alcohol and propylene glycol.

Compounds of formula (I) may be administered parenterally, that is by intravenous, intramuscular, subcutaneous intranasal, intrarectal, intravaginal or intraperitoneal administration. The subcutaneous and intramuscular forms of parenteral administration are generally preferred. Appropriate dosage forms for such administration may be prepared by conventional techniques. Compounds of Formula (I) may also be administered by inhalation, that is by intranasal and oral inhalation administration. Appropriate dosage forms for such administration, such as an aerosol formulation or a metered dose inhaler, may be prepared by conventional techniques.

For all methods of use disclosed herein for the compounds of Formula (I) the daily oral dosage regimen will preferably be from about 0.01 to about 80 mg/kg of total body weight. The daily parenteral dosage regimen about 0.001 to about 80 mg/kg of total body weight. The daily topical dosage regimen will preferably be from 0.1 mg to 150 mg, administered one to four, preferably two or three times daily. The daily inhalation dosage regimen will preferably be from about 0.01 mg/kg to about 1 mg/kg per day. It will also be recognized by one of skill in the art that the optimal quantity and spacing of individual dosages of a compound of Formula (I) or a pharmaceutically acceptable salt thereof will be determined by the nature and extent of the condition being treated, the form, route and site of administration, and the particular patient being treated, and that such optimums can be determined by conventional techniques. It will also be appreciated by one of skill in the art that the optimal course of treatment, i.e., the number of doses of a compound of Formula (I) or a pharmaceutically acceptable salt thereof given per day for a defined number of days, can be ascertained by those skilled in the art using conventional course of treatment determination tests.

The invention will now be described by reference to the following biological examples, which are merely illustrative and are not to be construed as a limitation of the scope of the present invention.

Biological Examples

The IL-8, and GRO-α chemokine inhibitory effects of compounds of the present invention are determined by the following in vitro assay:

Receptor Binding Assays:

[¹²⁵I] IL-8 (human recombinant) is obtained from Amersham Corp., Arlington Heights, Ill., with specific activity 2000 Ci/mmol. GRO-α is obtained from NEN-New England Nuclear. All other chemicals are of analytical grade. High levels of recombinant human IL-8 type α and β receptors were individually expressed in Chinese hamster ovary cells as described previously (Holmes, et al., Science, 1991, 253, 1278). The Chinese hamster ovary membranes were homogenized according to a previously described protocol (Haour, et al., J. Biol. Chem., 249 pp 2195-2205 (1974)). Except that the homogenization buffer is changed to 10 mM Tris-HCL, 1 mM MgSO₄, 0.5 mM EDTA (ethylene-diaminetetra-acetic acid), 1 mM PMSF (α-toluenesulphonyl fluoride), 0.5 mg/L Leupeptin, pH 7.5. Membrane protein concentration is determined using Pierce Co. micro-assay kit using bovine serum albumin as a standard. All assays are performed in a 96-well micro plate format. Each reaction mixture contains ¹²⁵I IL-8 (0.25 nM) or ¹²⁵I GRO-α and 0.5 μg/mL of IL-8Rα or 1.0 μg/mL of IL-8Rβ membranes in 20 mM Bis-Trispropane and 0.4 mM Tris HCl buffers, pH 8.0, containing 1.2 mM MgSO₄, 0.1 mM EDTA, 25 mM Na and 0.03% CHAPS. In addition, drug or compound of interest is added which has been pre-dissolved in DMSO so as to reach a final concentration of between 0.01 nM and 100 uM. The assay is initiated by addition of ¹²⁵I-IL-8. After 1 hour at room temperature the plate is harvested using a Tomtec 96-well harvester onto a glass fiber filtermat blocked with 1% polyethylenimine/0.5% BSA and washed 3 times with 25 mM NaCl, 10 mM Tris HCl, 1 mM MgSO₄, 0.5 mM EDTA, 0.03% CHAPS, pH 7.4. The filter is then dried and counted on the Betaplate liquid scintillation counter. The recombinant IL-8 Rα, or Type I, receptor is also referred to herein as the non-permissive receptor and the recombinant IL-8 Rβ, or Type II, receptor is referred to as the permissive receptor.

Representative compounds of Formula (I), Examples 1 to 106 have exhibited positive inhibitory activity in this assay at IC₅₀ levels <30 uM.

Chemotaxis Assay:

The in vitro inhibitory properties of these compounds are determined in the neutrophil chemotaxis assay as described in Current Protocols in Immunology, vol. I, Suppl 1, Unit 6.12.3., whose disclosure is incorporated herein by reference in its entirety. Neutrophils where isolated from human blood as described in Current Protocols in Immunology Vol. I, Suppl 1 Unit 7.23.1, whose disclosure is incorporated herein by reference in its entirety. The chemoattractants IL-8, GRO-α, GRO-β, GRO-γ and NAP-2 are placed in the bottom chamber of a 48 multiwell chamber (Neuro Probe, Cabin John, Md.) at a concentration between 0.1 and 100 nM. The two chambers are separated by a 5 uM polycarbonate filter. When compounds of this invention are tested, they are mixed with the cells (0.001-1000 nM) just prior to the addition of the cells to the upper chamber. Incubation is allowed to proceed for between about 45 and 90 min at about 37° C. in a humidified incubator with 5% CO₂. At the end of the incubation period, the polycarbonate membrane is removed and the top side washed, the membrane then stained using the Diff Quick staining protocol (Baxter Products, McGaw Park, Ill., USA). Cells which have chemotaxed to the chemokine are visually counted using a microscope. Generally, four fields are counted for each sample, these numbers are averaged to give the average number of cells which had migrated. Each sample is tested in triplicate and each compound repeated at least four times. To certain cells (positive control cells) no compound is added, these cells represent the maximum chemotactic response of the cells. In the case where a negative control (unstimulated) is desired, no chemokine is added to the bottom chamber. The difference between the positive control and the negative control represents the chemotactic activity of the cells.

Elastase Release Assay:

The compounds of this invention are tested for their ability to prevent Elastase release from human neutrophils. Neutrophils are isolated from human blood as described in Current Protocols in Immunology Vol. I, Suppl 1 Unit 7.23.1. PMNs 0.88×10⁶ cells suspended in Ringer's Solution (NaCl 118, KCl 4.56, NaHCO₃ 25, KH₂PO₄ 1.03, Glucose 11.1, HEPES 5 mM, pH 7.4) are placed in each well of a 96 well plate in a volume of 50 ul. To this plate is added the test compound (0.001-1000 nM) in a volume of 50 ul, Cytochalasin B in a volume of 50 ul (20 ug/ml) and Ringers buffer in a volume of 50 ul. These cells are allowed to warm (37° C., 5% CO₂, 95% RH) for 5 min before IL-8, GROα, GROβ, GROγ or NAP-2 at a final concentration of 0.01-1000 nM was added. The reaction is allowed to proceed for 45 min before the 96 well plate is centrifuged (800×g 5 min.) and 100 ul of the supernatant removed. This supernatant is added to a second 96 well plate followed by an artificial elastase substrate (MeOSuc-Ala-Ala-Pro-Val-AMC, Nova Biochem, La Jolla, Calif.) to a final concentration of 6 ug/ml dissolved in phosphate buffered saline. Immediately, the plate is placed in a fluorescent 96 well plate reader (Cytofluor 2350, Millipore, Bedford, Mass.) and data collected at 3 min intervals according to the method of Nakajima et al J. Biol. Chem. 254 4027 (1979). The amount of Elastase released from the PMNs is calculated by measuring the rate of MeOSuc-Ala-Ala-Pro-Val-AMC degradation.

TNF-α in Traumatic Brain Injury Assay

The present assay provides for examination of the expression of tumor necrosis factor mRNA in specific brain regions which follow experimentally induced lateral fluid-percussion traumatic brain injury (TBI) in rats. Adult Sprague-Dawley rats (n=42) were anesthetized with sodium pentobarbital (60 mg/kg, i.p.) and subjected to lateral fluid-percussion brain injury of moderate severity (2.4 atm.) centered over the left temporaparietal cortex (n=18), or “sham” treatment (anesthesia and surgery without injury, n=18). Animals are sacrificed by decapitation at 1, 6 and 24 hr. post injury, brains removed, and tissue samples of left (injured) parietal cortex (LC), corresponding area in the contralateral right cortex (RC), cortex adjacent to injured parietal cortex (LA), corresponding adjacent area in the right cortex (RA), left hippocampus (LH) and right hippocampus (RH) are prepared. Total RNA are isolated and Northern blot hybridization is performed and quantitated relative to an TNF-α positive control RNA (macrophage=100%). A marked increase of TNF-α mRNA expression is observed in LH (104±17% of positive control, p<0.05 compared with sham), LC (105±21%, p<0.05) and LA (69±8%, p<0.01) in the traumatized hemisphere 1 hr. following injury. An increased TNF-α mRNA expression is also observed in LH (46±8%, p<0.05), LC (30±3%, p<0.01) and LA (32±3%, p<0.01) at 6 hr which resolves by 24 hr following injury. In the contralateral hemisphere, expression of TNF-α mRNA is increased in RH (46±2%, p<0.01), RC (4±3%) and RA (22±8%) at 1 hr and in RH (28±11%), RC (7±5%) and RA (26±6%, p<0.05) at 6 hr but not at 24 hr following injury. In sham (surgery without injury) or naive animals, no consistent changes in expression of TNF-α mRNA are observed in any of the 6 brain areas in either hemisphere at any times. These results indicate that following parasagittal fluid-percussion brain injury, the temporal expression of TNF-α mRNA is altered in specific brain regions, including those of the non-traumatized hemisphere. Since TNF-α is able to induce nerve growth factor (NGF) and stimulate the release of other cytokines from activated astrocytes, this post-traumatic alteration in gene expression of TNF-α plays an important role in both the acute and regenerative response to CNS trauma.

CNS Injury Model for IL-1β mRNA

This assay characterizes the regional expression of interleukin-1β (IL-1β) mRNA in specific brain regions following experimental lateral fluid-percussion traumatic brain injury (TBI) in rats. Adult Sprague-Dawley rats (n=42) are anesthetized with sodium pentobarbital (60 mg/kg, i.p.) and subjected to lateral fluid-percussion brain injury of moderate severity (2.4 atm.) centered over the left temporaparietal cortex (n=18), or “sham” treatment (anesthesia and surgery without injury). Animals are sacrificed at 1, 6 and 24 hr. post injury, brains removed, and tissue samples of left (injured) parietal cortex (LC), corresponding area in the contralateral right cortex (RC), cortex adjacent to injured parietal cortex (LA), corresponding adjacent area in the right cortex (RA), left hippocampus (LH) and right hippocampus (RH) are prepared. Total RNA is isolated and Northern blot hybridization was performed and the quantity of brain tissue IL-1β mRNA is presented as percent relative radioactivity of IL-1β positive macrophage RNA which was loaded on the same gel. At 1 hr following brain injury, a marked and significant increase in expression of IL-1β mRNA is observed in LC (20.0±0.7% of positive control, n=6, p<0.05 compared with sham animal), LH (24.5±0.9%, p<0.05) and LA (21.5±3.1%, p<0.05) in the injured hemisphere, which remained elevated up to 6 hr. post injury in the LC (4.0±0.4%, n=6, p<0.05) and LH (5.0±1.3%, p<0.05). In sham or naive animals, no expression of IL-1β mRNA is observed in any of the respective brain areas. These results indicate that following TBI, the temporal expression of IL-1β mRNA is regionally stimulated in specific brain regions. These regional changes in cytokines, such as IL-1β play a role in the post-traumatic.

All publications, including but not limited to patents and patent applications, cited in this specification are herein incorporated by reference as if each individual publication were specifically and individually indicated to be incorporated by reference herein as though fully set forth.

The above description fully discloses the invention including preferred embodiments thereof. Modifications and improvements of the embodiments specifically disclosed herein are within the scope of the following claims. Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present invention to its fullest extent. Therefore the Examples herein are to be construed as merely illustrative and not a limitation of the scope of the present invention in any way. The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows. 

1. The compound N-[4-chloro-2-hydroxy-3-(1-piperazinylsulfonyl) phenyl]-N′-(2-chloro-3-fluorophenyl) urea, or a pharmaceutically acceptable salt thereof.
 2. A pharmaceutical composition comprising a compound according to claim 1 and a pharmaceutically acceptable carrier or diluent.
 3. A method of treating a ELR chemokine mediated disease, wherein the chemokine binds to an IL-8 β (CXCR2) receptor in a human comprising administering to said human in need thereof an effective amount of a compound according to claim 1, and wherein the disease is selected from the group consisting of asthma, chronic obstructive pulmonary disease and adult respiratory distress syndrome.
 4. The method according to claim 3 wherein the disease is chronic obstructive pulmonary disease.
 5. A method of treating a ELR chemokine mediated disease, wherein the chemokine binds to an IL-8 β (CXCR2) receptor in a human, comprising administering to said human in need thereof an effective amount of a compound according to claim 1, and wherein the disease is selected from the group consisting of inflammatory bowel disease, Crohn's disease, or ulcerative colitis.
 6. The method according to claim 5 wherein the disease is ulcerative colitis.
 7. The method according to claim 5 wherein the disease is inflammatory bowel disease.
 8. A method of treating a ELR chemokine mediated disease, wherein the chemokine binds to an IL-8 β (CXCR2) receptor in a human comprising administering to said human in need thereof an effective amount of a compound according to claim 1, and wherein the disease is selected from the group consisting of psoriasis and atopic dermatitis.
 9. The method according to claim 5 wherein the disease is psoriasis.
 10. The compound according to claim 1 wherein the pharmaceutically acceptable salt is selected from the group consisting of hydrochloride, bromide, sulfate, phosphate, methane sulfonate, ethane sulfonate, acetate, malate, tartrate, citrate, lactate, oxalate, succinate, fumarate, maleate, benzoate, salicylate, phenylacetate, and mandelate.
 11. The compound N-[4-chloro-2-hydroxy-3-(1-piperazinylsulfonyl)phenyl]-N′-(2-chloro-3-fluorophenyl) urea.
 12. A pharmaceutical composition comprising a compound according to claim 11 and a pharmaceutically acceptable carrier or diluent. 